Pump.



1. M. SHERMAN.

PUMP.

APPLICATION FILED NOV-21.1913.

Patented June 15, 1915.

2 SHEETS-SHEET1- IIII IIIIIIIIII WITNESSES INVENTOR fizz-272x222 A rmmvsy THE NORRIS FETERS.CO, PHOTG-LITHQ, WASHINGTON. D. c.

J. M. SHERMAN.

PUMP.

APPLICATION FILED NOV-21,1913.

1,143,325,; PatentedJune15, 1915.

2 SHEETS-SHEET 2.

IN l/E IV TOR Q TTOR/VE Y THE NORRIS PETERS co PHOTO-LITHCL. WA5HINGTUN4 D. C.

- provide provide a of Fig. 1.

To all whom it may concern."

entrain sraras m orripn.

JAMES M. SHERMAN, or nnnnnfi'rnxns.

BUMP.

Application filed November 21, 1913.

Be it known that I, JAMns M. SHERMAN, citizen of the United States, residing at Dallas, in the county of Dallas and State of Texas, have invented certain new and useful Improvements in Pumps, of which thefollowing is a specification.

My invention relates to a new and useful pump, and its object is to provide a pump that will eliminate intake and discharge valves by employing two pistons each having its own cycle of reciprocating motion.

The object more specifically stated is to a pump, comprising two pistons mounted to reciprocate independently in a single barrel, one of said pistons serving to draw fluid into the barrel while moving in a certain direction, and the other serving to discharge said fluid while later following the first one, the return strokes of the two pistons being simultaneous.

Finally,'the object of my inventionis to device of. the 'character described that will be strong, durable, efficient and simple and comparatively inexpensive to produce, also onein which the several parts will not be likely to get out of working order.

With these and other objects in view, the invention has relation to certain novel features of construction and operation, an example of which is described in the follow ing specification and illustrated in the accompanying drawing, wherein:

Figure 1 is a view showing my novel pump in side elevation, showing the po-v sitions,'occupiedjby the pistons, just after they have completedtheir return strokes. Fig. 2 is a longitudinal vertical sectional view of the same. Fig. 3 is a transverse vertical sectional view taken upon the line arm of Fig. 1. Fig. 4 is a transverse vertical sectional view taken upon the line ya] Fig. 5 is sectional view taken upon the line ez of Fig. 1. Figs. 6 and 7 are respectively surface developments of two cylindrical cams which in my invention respectively actuate the reciprocation of the two pistons. V

eferring' now more particularly to the drawings, wherein like reference characters designate similar parts in all the figures,

the numeral 1 denotes the barrel of my pump, which is preferably mounted horizontally, and is held spaced above a platform 2, by one or more legs 3. Adjacent to Specification of Letters Patent.

ties of a shaft 16,

a transverse, vertical Patented June 15, 1915. Serial No. 802,184.

its extremities the barrel 1 is formed with annular chambers 4:, communicating with the barrel interior through ports 5. With the chambers 4c, intake and discharge pipes 6 and 7 respectively have communication.

lVithin the intake and discharge end portions of the cylinder 1, there are respectively mounted similar elongated pistons 8 and 8 each preferably carrying one or more packing-rings 9 upon its inner end. From the outer ends of the two pistons, alinecl rods 10 are rigidly extended in opposite directions. Upon the rods 10, there are loosely mounted elongated sleeves 11 of square cross-section, terminatingattheir outer ends flush with the outer received at said ends in brackets 12 respectively mounted upon the extremities of the platform 2. The apertures in the brackets 12 receiving the sleeves 11 are of square shape, permitting ets, but restricting the sleeves against rotation. In order to produce a unity of sliding displacement between each sleeve 11 and the correlated rod 10, without restricting the latter member from rotation independent of the former, a set-collar 14 is mounted fast upon each rod 10, contiguous with the inner extremity of the correlated sleeve 11, and is recessed within a square casing 15 bolted fast to said sleeve.

The brackets 12 are extended above the sleeves 11 to form bearings for the extremiparallel to the axis of the ends of the rods 10, and

sliding displacement of said sleeves relative to the correlated brackbarrel 1, and spaced above said barrel, a

driving-pulley 17 being mounted fast upon said shaft. Adjacent to the ends of the shaft 16, there are respectively mounted cylindrical cams 18 and 19, which respectively carry continuous curved threads 20 and 21, each engaging between a pair of lugs 22 formed integrally upon the adjacent sleeve 11.

An explanation of the operation of the above-described device will now be given. To start with, it may be considered that the various parts occupy the positions, shown in Figs. 1, 2, 3, 4 and 5. During the first third of a revolution, the cam 18 will actuate the piston 8 forwardly through a complete stroke, displacing said piston to the position shown in Fig. 2 The piston 8 will remain stationary until the other piston is completing its stroke, so that the space vacated by the piston 8" may fill with a fluid entering the position shown in Fig.

are undergoing tion, the piston 8 remains stationary and the piston 8 moves steadily forward, forcing V the fluid through the discharge ports 5 and chamberl into the pipe 7 After having completed its forward stroke, the piston 8 willbe either in contact with or very closely adjacent to the piston 8. While the cams 18 and 19 are completing the last third of a revolution, the relation between the pistons 8 and 8 just described remains the same, the rearward strokes of the two pistons being simultaneously accomplished. The developv v .Copiesof this patent ,may be obtained for mentsof the two cam surfaces shown in Figs. 6 and 7 give a clear idea of the manner I j .in which the proper relative positions of the "pistons are at all times maintained during a revolution of the cams.

By eliminating valves from the above-described pump, the cost of constructing the same is reduced and the operation is so simplified as to make repairs very infrequent and obviate a considerable part of the attention required by most pumps. 7

While it is preferred to drive my pump other driveinechanisms may the other remains stationary,

'two subscribing by means of c ams as illustrated and (ilescribed herein, it is to be understood that produce the same piston motions. My 111-.

vention is presented, therefore, as including allsuch modifications and changes as properly come within the scope ofthe following claims: f

What I claim is:

A pump, comprising a barrel, having 'inlet 'i and outlet ports adjacent to its extremities, two pistons mounted to reciprocate independently in said barrel, alined rods oppositely projecting from each piston, sleeves within; which said rods aremeans for causing a simultaneous sliding movement of the rods'and sleeves, means slidably supporting said sleeves and restricting the 7 same against rotation, and .cams,respectively engaging said sleeves, for causing reciprocatingwrnotion of the two pistonssuch that one moves forward while moving forward while theifirst' one remains stationary, stroke in unison. V V j V In'testimony whereof I have signed my name 'to-thisspecification inthe presence of witnesses. V

SHERMAN. x

JAMES M.

' Witnessesz. V c 1 .JACK'A. S LEY,

Y JFSPMURRAY'.

free to rotate, V

the other then 3 the two undergoing their return i five cents each, by addressing the Commissioner of Patents. Washington,-D.G. 

